Explanation Write the expression for the energy in the pulse. E = P Δ t (I) Here, E is the energy of the pulse, P is the power of the pulse, and Δ t is the time of time period of the pulse. Write the expression for the energy of each photon. E γ = h c λ (II) Here, E γ is the energy of each photon, h is the Planck’s constant, c is the speed of light, and λ is the wavelength of the photon. Therefore the number of the photons present in the laser pulse is equal to the ratio of energy of pulse and energy of each photon. Write the expression for the number of photons in the pulse. N = E E γ (III) Conclusion: Substitute 1.00 MW for P , and 10.0 ns for Δ t in equation (I) to find E . E = ( 1.00 MW × 1 W 10 − 6 MW ) ( 10

Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 9th + WebAssign Printed Access Card, Multi-Term

9th Edition

ISBN: 9781305932302

Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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Nature of light

Light is transverse and electromagnetic radiation that exhibits the properties of a wave as well as a particle. For this reason, light is said to have a “dual nature.”

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Chapter 42, Problem 61P

To determine

The number of photons present in the pulse.

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Chapter 42, Problem 60P

Chapter 42, Problem 62P

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Chapter 42 Solutions

Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 9th + WebAssign Printed Access Card, Multi-Term

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The number of photons present in the pulse.

Solution Summary: The author explains that the number of photons present in the laser pulse is equal to the ratio of energy of pulse and energy.

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The number of photons present in the pulse.

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Chapter 42 Solutions